Since the Collaborative for Academic, Social, and Emotional Learning (CASEL) launched the Collaborating States Initiative (CSI) to support social and emotional learning (SEL) in 2016, participation has grown dramatically. CASEL initially planned to work with five states. In the past two years, the CSI team and its partners have worked with 25, which collectively serve about 11,500 school districts, 58,000 schools, and 30 million students. The purpose of the CSI is to help state education agencies create statewide conditions that will encourage and equip educators at the district level to engage in the work of promoting integrated, equity-focused, academic, social, and emotional learning. This report offers an in-depth look at some innovative efforts currently underway in six states (Delaware, Iowa, North Dakota, Minnesota, Rhode Island, and Wisconsin) to actively partner with and support districts. These states are using a variety of strategies to engage stakeholders, create a learning community, and help districts navigate the challenges of implementing high-quality SEL. [For the companion report, "Innovation in Action: How States and School Districts Are Collaborating to Promote Academic, Social, and Emotional Learning," see ED597734.]